Ecuador has always been FARC's safe rear area.
Common FARC guerrillas keep their families on the Ecuadorian side of the border, and frequently visit them there. They take their R&R there, hanging out in the local taverns, they buy their supplies there in the local grocery and hardware stores. The police look the other way; I was told that as long as they don't show their weapons, they prefer not to get involved.
There are occasional shootouts in the bars, however, between Farc guerrillas and anti-Farc paras taking their day off in the same place at the same time.
Ecuadorian special police and military units do patrol, but they have a talent for uncovering guerrilla camps that have already been vacated; their primary interest is in dealing with Ecuadorian guerrilla-wannabes, not the real thing.
FARC guerrillas also invest their money on the Ecuadorian side, sometimes openly in their own names, sometimes through Ecuadorian partners, buying up farms, hotels, bars and so on. Ecuadorians comment that if a FARC guerrilla makes you an offer, you're not really in a position to haggle too much about the price.
Ecuadorian military and customs officers have been caught facilitating weapons and other supply transfers through Ecuadorian seaports to the interior, one Ecuadorian politician was assassinated by Colombian anti-Farc "paras" supposedly for his involvement in weapons trafficking to the guerrillas (as well as his involvement supposedly in recruiting Ecuadorian students into armed militant groups). Ecuadorian intel involvement in his murder might be supposed from the fact that the Colombian shooters were allowed to get away, and the only arrests made (rather quickly) were of local gophers who didn't know much.
Ecuador tries to walk down the middle, they don't want a guerrilla war spilling over the borders, and they don't have the muscle to face FARC even if they wanted to. And if you are well placed and well connected, there is money to be made by looking the other way as FARC supplies flow through Ecuadorian ports.
I'm glad Uribe is finally getting assertive about this with the two regional clown leaders who plague his eastern and southern borders. Both of Chavez and Palacios are idiots and malandros.